Ok new to DSLR. Just got Sony a-100 camera that came with 18 - 70mm lens.
Looking for telephoto. It would seem that my 70 mm DSLR equals my 35mm (film) 50mm lens, is that correct?
So If I want a DSLR Telephoto i would need at least (digital)75 mm to 300 to yield a
50 to 200 +/- 35mm (film) format lens since it would appear the format is different by 50%
Any one care to reference why it isn't the same? This isn't metric to US units so let me know.